<p>Mike Massimino's dream of becoming a NASA astronaut was slipping away. He was rejected for years by the NASA space program. They even told him he wouldn't qualify due to his poor eye site. Massimino wouldn't even let that stop him.</p>

Mike Massimino's dream of becoming a NASA astronaut was slipping away. He was rejected for years by the NASA space program. They even told him he wouldn't qualify due to his poor eye site. Massimino wouldn't even let that stop him.

03 - Mike Massimino: "Giving up is unthinkable"

Mark Malkoff talks to top achievers about how their amazing persistence has shaped their careers and lives. Want to be more tenacious, relentless, and resilient in the things you care about? Then this is the podcast for you! Guests give practical tips on how to achieve your goals and dreams while going past constant roadblocks and persevering during difficult times. These include Soledad O'Brien (EMMY winning journalist), Alan Menken (Oscar winning composer), Aasif Manvi (Daily Show with Jon Stewart), and Mike Massimino (former NASA astronaut).

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03 - Mike Massimino: "Giving up is unthinkable"

03 - Mike Massimino: "Giving up is unthinkable"